Add an image allocation pool to the OpenVG paint engine

Some OpenVG GPU's have limitations on the amount of memory
available to create VGImage's.  When the memory runs out,
vgCreateImage() will fail.

This change introduces QVGImagePool, which keeps track of all
QVGPixmapData image allocations and ejects least-recently-used
pixmaps when GPU memory is exhausted.

Task-number: QT-2554
Reviewed-by: trustme

1 files changed, 4 insertions, 0 deletions

diff --git a/src/openvg/qwindowsurface_vgegl.cpp b/src/openvg/qwindowsurface_vgegl.cpp
index 15710830f6..bda60965f0 100644
--- a/src/openvg/qwindowsurface_vgegl.cpp
+++ b/src/openvg/qwindowsurface_vgegl.cpp
@@ -42,6 +42,7 @@
 #include "qwindowsurface_vgegl_p.h"
 #include "qpaintengine_vg_p.h"
 #include "qpixmapdata_vg_p.h"
+#include "qvgimagepool_p.h"
 #include "qvg_p.h"
 
 #if !defined(QT_NO_EGL)
@@ -360,6 +361,9 @@ void qt_vg_hibernate_pixmaps(QVGSharedContext *shared)
         pd = pd->next;
     }
 
+    // Hibernate any remaining VGImage's in the image pool.
+    QVGImagePool::instance()->hibernate();
+
     // Don't need the current context any more.
     shared->context->lazyDoneCurrent();